The expression shown in the image is:

$2ax^2 - 3b - bx^2 + 6a$

Let me know if you'd like to simplify this expression, factor it, or explore further in a specific way!

Would you like more details or have any questions? Here are 5 related questions you could explore:

1. How do we factor this expression?
2. Can we collect like terms in this polynomial?
3. What happens if we substitute values for $a$, $b$, and $x$?
4. Is this expression a quadratic equation in terms of $x$?
5. How does the structure of this expression change if $a$ or $b$ equals zero?

Tip: When simplifying expressions with multiple variables, always start by grouping similar terms!